Jacob ross grove



(No Mode-1.)

J. R. GROVE.

INGANDBSGBNT LAMP.

No. 530,838., m1611181 Dec. 11, 1894.

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JACOB ROSS GROVE, OF NEW YORK, N. Y., ASSIGNOR TO IVAIIIER E. PECK,TRUSTEE, OF SAME PLACE.

INCANDSCENT LAM P.

SPECIFICATION forming part of Letters Patent No. 530,833, dated Decemberl l, 1894. Application tiled May 26,1893. Renewed May 14, 1894. SerialNo. 511,256. (No model.)

To all whom t may concern:

Be it known that I, JACOB Ross GROVE, a citizen of the United States,and a resident of the city, county, and State of New York,

have invented certain new and useful lmprovements in Incandescent Lamps,of which the following is a specification.

My present invention is directed to the production of an incandescentlamp of the so- I0 called two-part type which shall not only be ofdurable and inexpensive construction but which will at the same time,provide for the' complete sealing of the neck, so as to maintain thevacuum and henceinsure the maxi- I: mum candle power and operativenessof the u filament.

Under certain conditions, a two part lamp will be especially valuablefrom the fact that the independent character of the neck closing sectionwill admit of its detachment, the renewal of the filament and thereadjustment of the said neck closing section. In all forms of two-partlamps with Which I am familiar the desideratum noted has been defeatedowing to the impossibility of securing a perfect sealing of the bulb.

The difficulties alluded to are obviated by my improvements and manyother important advantages secured.

In the drawings accompanying this specilication Figure l, is a verticalelevation of so much of an incandescent lamp as embodies my invention.Fig. 2, is a Vertical sectional elevation of the construction shown inFig. l.

3 5 Figs. 3 and 4., are also vertical sectional elevations showingfurther modifications.

In so far as the construction shown in Figs. l and 2 is concerned, theneck a, of the bulb A, is closed by a section of fusible material 4o Bcast thereon and centrally in which, a vertical glass tube b, isembedded in the operation of casting. rlhe section B, is preferably ofmetal although other materials such for instance as gutta percha, may besubstituted.

The section-B, is cast with socket engaging provision-that is to saywith side threads or otherwise. In the drawings the section is shown asbeing provided with annular proj ections c, an arrangement familiar in aprior 5o construction. The central portion of the tube d, is of expandedform so as to reduce the amountof metal or material in the section B,

to a minimum. The upper solid end of the tube extends into the bulb toconstitute the mount c, While the lower open endf, which is below thesection B, is a dovetail form in longitudinal section. A leading in Wireg, pierces the mount, extends vertically in the tube and is electricallyconnected at its lower terminal to a metal cap N, for a key contact 6cas will be obvious to those familiar with the general subject. The otherleading in wire t', passes through the wall of the tube and is embeddedin the section B, to complete the lamp circuit through the socket. Inorder to absolutely insulate the leading in wires Within the hollow partof the tube, the latter is preferably filled with some agent j, such as'plaster of paris. The cap N, which closely embraces the dovetail end f,is securely attached thereto by means of an interposed layer of cement.

Vhen the filament has become so impaired that it is no longerserviceable, the section B, can be subjected to heat, the bulb detached,7 5 the filament superseded by a fresh one and the parts restored totheir proper operative relation.

While in a majority of cases, the casting of the section B, on the bulbneck will result in 8o such an intimate union of the adjacent portionsof the glass and cast material, that the vacuum will be ettectuallypreserved, still in most instances and as an additional precaution Iprefer to externally apply a sealing medium impervious te the air.

In practice, I may employ any one of a number of agents for the purposestated. In Figs. l and 2, I have indicated by solid lines Z, theapplication of a varnish of asphaltum, 9o the same being applied to theouter adjacent portions of the section B, and bulb neck, and also to theadjacent parts of said section B and lower depending portion of thetube. Asphaltum varnish has been ascertained to be .particularlysuitable as a sealing agent both on account of its capacity for adheringto the parts and its extreme imperviousness to the air.

The embodiment of the invention can be roo inodiiied to the extent ofapplying the additional sealing agent to a construction wherein theneel; is closed by an internal plug', held in position by beingcemented, or otherwise. Thus for instance in Fig. 3,1 have shown theneck a, oi: the bulb closed by a plug n, of glass or other materialcemented in position; a sealing agent such as asphaltum varnish beingapplied on the underside to completely seal the lamp.

Fig. 4t, shows still another forni, the neck a, of the bulb beingprovided with a lateral flange 0,'against which a corresponding tlangep, of the neck closing section g, bears, the connection of the two beingmade by cementing. The flanges are covered by the sealing agent asindicated by the solid line r.

The application ot the external sealing niediuin requiring as it doesonly a small amount of time and labor does not appreciably increase theexpense ot manufacturing the lamp, `while on the other hand,the resultobtained is most important.

While this specification contains subject matter similar to thatpresented in companion cases iiled by me on May 17, 1893, Serial No.474,605, and on September 14, 1893, Serial No. 485,453, l make no claimto the same herein except in so far as it is specifically covered.

Having described my invention, what 1 claim as new, and desire to secureby Letters Patent, iis- 1. 1n an incandescent lamp, the combination withbulb having its neck closed by an independent section of fusiblematerial spanning the neck opening of a non-metallic yielding sealingmedium located on adjacent parts of glass and said section,substantiallyas set forth.

2. 1n an incandescent lamp, the combination with a bulb having its neckclosed by an independent section of fusible material spanning the neckopeningo'f a coating of asphaltuni applied to adjacent parts ot glassand said section, substantially as set forth.

3. in an incandescent lamp the combina` tion with the bulb, of anindependent section of cast material closing the neck of the same andhaving integral ridge or thread to adapt it for engagement With thesocket, substantially as set forth.

4. 1n an incandescent lamp, the combination with a bulb having its neckclosed by an independent section ot fusible material spanning` the neckopening, ot a vertical tube of insulating material embedded in saidfusible section and expanded as described, together with leading inwires and a Iilament, substam tially as set forth.

1n testimony that l claim the foregoing as my invention I have signed myname, in presence of two witnesses, this Z-ith day of May, 1803.

JACOB ROSS GROVE.

.Vitnesses:

WILLIAM PAXTON, ALFRED D. Wickns.

